hey i am just curious if i wanna change the link color and what not where do i put the code and theres my link to my whole page and to my css is : www.geocities.com/pinhead7987@sbcglobal.net/stylesheet.css

hope ya'll can help

Just put the link sections anywhere in your stylesheet, they don't have to be in any particular spot except they can't be inside another section. (eg you can't have body { ... a:link {...} }

Here's a fixed up version of your current stylesheet.

#header {
margin : 20px;
padding : 10px;
height : 100px;
}
#left {
position : absolute;
left : 15px;
top : 160px;
width : 200px;
}
#center {
top : 0;
margin-left : 230px;
margin-right : 15px;
}
body {
background-image : url(http://www.geocities.com/pinhead7987@sbcglobal.net/background.gif);
background-repeat : no-repeat;
background-position : center;
background-attachment : fixed;
font-family : arial;
color : #ffff00;
letter-spacing : 0;
font-weight : normal;
margin-top : 0;
margin-bottom : 0;
margin-left : 0;
margin-right : 0;
padding-top : 0;
padding-bottom : 0;
padding-left : 0;
padding-right : 0;
}
A:link
{ text-decoration: underline; color:#000000; }
A:visited
{ text-decoration: line-through; color:#0000ff; }
A:active
{ text-decoration: none; color:#008000; }
A:hover
{ text-decoration: overline; color:#ffff00; }

Inside the { } of the last 4 sections you can put whatever you want to style the links.

you have 2 sets of links in there, decide which one you want and delete the other set. The one at the bottom, you have a } missing at the very end.